Stephan Uphoff wrote:
> On Sun, 2005-07-03 at 20:02, Scott Long wrote:
>>>Stephan Uphoff wrote:
>>>>>I suspect the changes in revision 1.272 of kern_exec.c trigger the
>>>copy operation.
>>>>>>Looks like you need a noatime option for union_fs.
>>>>>>Stephan
>>>>Does this mean that every vnode that gets executed gets dirtied and all
>>its pages resynced to the backing store, or just the inode block?
>>> The kernel calls VOP_SETATTR to set the access time of the file.
> union_fs detects that it does not have an upper layer copy of the file
> to modify the attributes on and decides to copy it.
> The vm layer does not (directly) come into play on this.
>> Stephan
>
Ok, so this is just a limitation of unionfs, not the vnode pager. You
had me scared that we'd be doing a whole lot of needless disk i/o.
Scott